CVE-2026-73212
coturn peer-IP ACL canonicalization & scope bypass on the RFC 6062 TCP CONNECT relay path → internal-network SSRF and proven internal root RCE
- State
- Published
- Severity
- 5.8 Medium
- Published
- Aug 11, 2026
- Updated
- Aug 11, 2026
- Reserved
- Aug 11, 2026
Description
Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.13.1, good_peer_addr() in src/server/ns_turn_server.c uses ioa_addr_in_range() in src/client/ns_turn_ioaddr.c without canonicalizing IPv4-compatible, 6to4, and 64:ff9b::/96 NAT64 address forms, allowing an authenticated RFC 6062 TCP CONNECT relay client to bypass an IPv4 denied-peer-ip range when the Coturn host has a useful translation route. This issue is fixed in version 4.13.1.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.8 Medium | CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H | GitHub_M |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
coturncoturn |
|
References
- https://github.com/coturn/coturn/security/advisories/GHSA-2x4g-wx24-48m4
- https://github.com/coturn/coturn/pull/1945
- https://github.com/coturn/coturn/pull/1947
- https://github.com/coturn/coturn/commit/cf4b4952de48510d38415b96300da5fc674bfdda
- https://github.com/coturn/coturn/commit/d49ee56aa9fe748af064853d5e430eec1ccc3cbc
- https://github.com/coturn/coturn/releases/tag/4.13.1
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